Tuyere



July 8, 1952 N, EVEN 2,602,661

TUYERE' Filed July 14, 1950 2 Sl-lEETS-Sl-EET 1 INVEN TOR. Moi/04 .4: 31/5 BY I M July 8, 1952 N. EVEN 2,602,661

TUYERE Filed July 14, 1950 2 SHEETSSHEET z FIE E IN V EN TOR. [VIC/{04 4s EVA-"1V QMM i Arm/ways Patented July 8, 1952 STATES PATENT OFFICE neapolis Moline Company, Hopkins, Minn., a

corporation of'Minnesota i. I 13 Claims.

' This invention relates to improvements 'in tuyeres for the walls of blast furnaces or cupolas, used in melting iron and the like in foundries, and which tuyerescontrol the admission of air for combustion.

1 The primary object of my invention is to provide a tuyere of novel construction which will so control and direct the air blast as to materially improve the production and efiiciency of such furnaces, and which will permit convenient and precise control of the air.

Another object is to provide a tuyere which will" direct the air blast downward into the furnace to'the point where it will materially and measurably increase the combustion efiiciency.

Still another object is to provide a tuyere having a draft control gate,- or gates, with fins thereon movablewith the gates, as they are opened, into the air passage into such position as to angle a-ndjdirect a part of the air blast. downward and inward into the combustion chamber.

These and other more detailed and specific objects will be disclosed in the course of the following specification reference being hadto the accompanying drawings. in whichf Figj; dis a perspe tive view of a complete tuyre acco ding to my invention Viewing the same from the outer or inlet side.

---Fig. -2 is a vertical"crosssectional view, with parts of the operating mechanism'for the draft gates omitted. 6 --"Fig. 3 is a horizontal sectional View, also with apart of the operating mechanismo mitted and showing one draft gate open and the other closed,

the view being taken alongthe line 3-3 in Fig. 2;

prises a housing or tuyere box with inwardlydiverglng or flaring end walls ll,- top [2 and bottom 13' forming an inwardly,- horizontally flaring air-passage as will be clearlyapparent; Preferably;;also,the inner part of the bottom i 3 angles downward in the direction of air delivery; as seen i'niFig; 2, since the lower'strata ofinflow-v ing combustion air angles and flows downward as willpresently appear. 7,

v" 1h'e"narrower, outer 'or inlet "end of thebox lllmay be'selectively closed off by-complementary draftigates or doors M i-I15 each of whichh'a'sia vertical 'pintle or trunnion "I Gjournaled' in spaced Application July 14, issmserial No. 175,786 6 relation into the top 12 and bottom 13 of the box. The arrangement is such-that the gates 'l4 l 5, when swung in one direction,'will close oft this outer end of the box and when swung in the opposite direction will move to parallel positions at which they will offer little resistance to inward air travel and thus open the tuyere box. The gate 14 is shown ,open in Fig. 3 and-the gate 15 closed. The gates are moved to and between these positions by separate. actuating racks l'|-l8 meshing with gearsor gear teeth IS on the upper ends of the pintles l6 and these racks are slidable,'inwardly and outwardly; in recesses formed in the underside of the top 12 (Fig. 2) and through a guide bracket 2 lsecuredat 22 to the outer end of said top. -Outward1y of the tuyere the racks 11-18 diverge at 23 'and'are pivotally attached at 24 to separate rock levers 252 6, the latter being fulcrumed'at 21 to bracket arms 28 extending outward and-upward from the outer end of the tuyere box'bottom l3, as seen'in Fig. 1. To the lower ends of the rock levers 25- 26 I then pivot at'29 suitable control mechanism such as represented by the links 30 and separate knob'bed controlhan'dlesi l-32.; Thus, by moving the'handles 31-32 ,the racks I| I8 may be'adjusted to open and close either or both draft gates i.-- I5 as required to properly regulate the air infiowtothe combustion chamber of thefurnace andas "will be readily understood "For the 'journal accommodation of the .upper and lower ends of the pintles Hithetop and bottom of the tuyere' boxis provided with suitable bearing; openings, designated throughout 1 at 33 (Fig:2)1 v J The" draft gates l4i5'car'ryf.air directing vanesor fins 34- -35 on their inner surfaces'and at .or abov 'e the -midway point of the g-atesyertically, These vanes are formed integrally with, or secured in any, suitable fashion to, the gates and-however formed are. angularly' disposed with respect to- Lthe" horizontal so as to angle inwardly and downwardlywhen the gates'are open,fas' seen in Fig. .ZJThus the lower strata or part of the air enteringithrough the tuyererwill be deflected in a downward direction into the furnace andI find. that this movement of the air bringsitto the point Where most needed, with a resultinginicrease in combustion efficiency Isuch as tof materially 'increase; the production: capacity for. 1a given furnace; The j importance of this .feature will t s :b re d y; ap a nt toyt o eisk led i e t- Th s i pwn d' e ctiono the ai @1 10 as, th ene i ia ef ect Qt prevent n br d in of material over the tuyres- This bridging oc'- curs at present over the lower tuyeres but I flnd that by using for the upper tuyeres a construction such as that herein disclosed that the downward flow of air from these upper tuyeres will break up the tendency of air to flow upwardly just inside the inner wall of the cupola and will cause the air to penetrate the material toward the center of the cupola, with better combustion resulting. It is my belief that it is this upwardly flowing and comparatively cool air which cools the material sufl'iciently to cause it to harden and bridge over the lower tuyeres, making it necessary to periodically introduce a tool through these tuyres and break up the hardened bridged material.

As viewed from above the vanes 3435 ar sector or quadrant shaped, as shown in Fig. 3, having arcuate outer edges 36 and the shape and size of the vanes is further such that they will substantially completely span the spaces outside of the gates as they open. Thus the air flowing through these spaces. will be guided and directed as desired While the vanes will in no way interferewith the opening and closing movements of the gates.

It is understood that suitable modifications may be made in the structure as disclosed, provided such modifications come within the spirit and scope of the appended claims. Having now therefore fully illustrated and described my invention, what I claim to be new and desire to protect by Letters Patent is:

1. A tuyere of the character described, comprising a tuyere box having anair passage therethrough, a draft gate pivotally mounted in the box, means for opening and closing the gate to control the passage of air, and a vane on the gate for deflecting a part of the air passing through the box.

2. In a tuyere for the wall of a blast furnace,

a tuyere box having an air passagefor directing air into thefurnace, a draft gate pivotally mounted in the box and movableto and between open and closed positions for controlling air flow through said passage, and a vane on the draft gate movable therewith as the gate opens into a position for deflecting a part of the air downward through-said passage into the furnace.

' 3. In a tuyere for the wall of a blast furnace, a tuyere box having an air passage for directing air into the furnace, a draft gate pivotally mounted in the box and movable to and between open and closed positions for controlling air flow through said passage, and a vane on the draft gate movable therewith as the gate opens into a position for deflecting a part of the air downward through said passage into the furnace, the said tuyre box having a bottom angled downward in the direction taken by the air deflected by said vane.

4. In a tuyere for the wall of a blast furnace, a tuyere box having an air passage for directing air into the furnace, a draft gate pivotally mounted in the box and movable to and between open and closedpositions for controlling air flow through said passage, and a vane angularly positioned on the upper part of the gate for directing a part of the air downward into the furnace when the gate is opened.

5. A tuyere of the character described for controlling and directing air inflow to a blast furnace, comprising a tuyere box having an opening into the'furnace, a gate pivoted at upper and lower ends inside the box and swingable from a closed position to an open positio'n'at which an air passage is formed alongside the gate, an angular vane on the gate swingable therewith and having an arcuate edge whereby the vane will swing across said air passage as the gate is opened and thereby deflect a part of the air flowing into the furnace.

6. A tuyre of the character described for controlling and directing air inflow to a blast furnace, comprising a tuyre box having an opening into the furnace, a pair of gates pivoted at upper and lower ends inside the box alongside each other and swingable from closed positions to parallel positions to open the box, and vanes angularly set on the gates to span part of the opening through the box when the gates are opened and direct a part of the air downward into the furnace.

7. A tuyere of the character described for controlling and directing air inflow to a blast furnace, comprising a tuyere box having an opening into the furnace, a pair of gates pivotedat upper and lower ends inside the box alongside each other and swingable from closed positions to parallel positions to open the box, and vanes angularly set on the gates to span part of the opening through the .box when the gates are opened and direct a part of the air downward into the furnace, the said tuyre box having diverging portions flaring into the furnace to disperse the air thereinto.

8. A tuyere of the character described for controlling and directing air inflow toa blast furnace. comprising a tuy-ere box having an opening into the furnace, a pair of gatespivoted at upper and lower ends inside the box alongside each other and swingable from closed positions to parallel positions to open the box, vanes angularly set on the gates to span part of the opening through the box, when the gates are opened and direct a part of the air downward into the furnace, gear teeth on the gates, racks slidably supported on the box in meshing engagement with said teeth, and means for separately sliding the racks to open and close the gates. k p v 9. A tuyre of the character described for controlling and directing airl inflowto a blast 'furnace, comprising a tuyre box having an opening into the furnace, a pair of gates pivoted at upper and lower ends inside the box alongside each other and swingable from closed positions to parallel positions to open the box, vanes angularly set on the gates tospan part of the opening through the box when the gates are opened and direct a part of the air downward into the furnace, gear teeth on the gates, racks slidably supported on the box in meshing engagement with said teeth, and means for separately sliding the racks to open and close the gates',the said means comprising brackets on the tuyere box, rock levers fulcrumed on the brackets and pivotallyv connected at one end to theracks andknobbed handles linked to the opposite ends of the rock levers. g 1

10. In a tuyere for a cupola, atuyere box having an air passage to direct airinwardly into the cupola, at least one draft gate adiustably mounted in the box to regulate the flow of air therethroug'h, and a vane on the gate inwardly'and downwardly angularly positioned with respect toIthehorizon-e tal to "direct the inflowingijair downward from thebox.

11. In a tuyere for a cupolaija tuyerejbox having an air passage to direct an inwardly into the cupola, at least one draft gate pivoted on. 'a vertical axisin the boxjtofcontrol the flower air therethrough, and a vane on the gate angled inward and downward. to correspondingly direct the flow of air inward through the box.

12. A tuyere of the character described for controlling anddirecting air inflow to a blast furnace, comprising a tuyre box having an opening into the furnace, a pair of gates having separate pivot connections in the box and swingable about said connections in generally horizontal planes to regulate air flow through the box, and vanes angularly located on the gates to direct the infiowing air downward.

13. A tuyre of the character described for controlling and directing air inflow to a blast furnace, comprising a tuyre box having an opening into the furance, a pair of gates having separate REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 300,405 Great Britain Nov. 15, 1928 435,313 Germany Oct. 9, 1926 

